T5 individual reflectors VS One big one

Discussion in 'Lighting' started by RiaanP, 24 Aug 2009.

  1. RiaanP

    RiaanP Moderator

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    Is there any difference on T5 lights if you use individual reflectors for each globe or one big reflector behind the bank of globes.

    Most T5 pendants, be it 4, 6 or 8 globe setups, only have one combined flat reflector behind all the globes.

    Does it affect globe lifespan?

    Do pendants use one for compactness? Because an individual reflector is about 6cm wide.

    Also the pendants mostly do not have fancy bended like a W reflectors. I saw one reflector that boost the fact that it got 29 bends in it. Are they really that much better? If Yes why do pendants not have them?
     
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  3. Ridwaan

    Ridwaan

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    If you look at the ATI powermodule, it is rated amongst the best in the world and this pendant comes with individual reflectors..

    I think its all about colour mixing if im not mistaken.The pros will be able to help out here...
     
  4. Junz

    Junz

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    good question....tagging along
     
  5. Loki

    Loki cable tie ninja

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    Ditto
     
  6. RiaanP

    RiaanP Thread Starter Moderator

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    OK, I did look up the ATI powermodule.
    And compared it with some Chinese import as listed on one of the sponsers website.

    The 4 tube ATI is 24cm wide where the Chinese one is 18
    For a 6 tube the ATI is 35 where the Chinese one is 27.

    The ATI even comes in a 8 and 10 tube config. (Wonder what that price will be in our SA rands...) Being 44.5cm wide and 54.5cm. There was no Chinese 8 or 10 tubes setups.

    Is the width the thing?

    Who is a lightning expert?
     
  7. Sentari

    Sentari

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    While you on the topic. Would a painted white hood in the inside have the same effect?
     
  8. Nemos Janitor

    Nemos Janitor

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    Here are two links of T5 reflector designs. But the fittings do cost a whack.

    http://www.sfiligoi.it/files/media/CATALOGHI%20INGLESE/STEALTH%20ING.pdf

    Giesemann Lichttechnik -
     
  9. RiaanP

    RiaanP Thread Starter Moderator

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    Sentari - I doubt if a white hood will reflect the same amount as a proper reflector. The white do absorb some light.

    Thank you Nemos J
    I did google the ATI powermodule after Ridwaan's comment.
    Yes Gieseman, Stealth and the ATI looks NICE

    Cheapest I saw the ATI works just under R4000 for a 54W 4 Tube setup.
    They are not cheap... After adding shipping, import duties and local profit margins...:(

    What I notice is that on cheap Chinese models they can fit in more tubes on the same width unit. Because each individual reflector takes between 5-6cm space.

    What is wrong if light is reflected back unto the tube? Should it not just keep on passing right through it? Or Does it have something to do with overheating the tube? You say ideal temp should be 35C. That is why these expensive pendants include fans - with exception to the Gieseman pendant.
     
  10. Nemos Janitor

    Nemos Janitor

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    Riaan i don't know about the light reflecting back at the tube. I will make some enquiries for you.

    If you go onto the giesemann site and look up the globes it tells you the recommended operating temp. I think the D-D aquarium solutions new site also has a bit about the T5 globes.

    Just out of interest. In the early days D-D (Dave Saxby) developed the range of T5 globes that are now called Giesemanns.

    Riaan what i can tell you is that heat shortens the life of a T5 tubes big time. You often see reefers quote 6 months and the T5 globes need to be replaced. This is due to heat. Globes that are installed in fittings with cooling systems last much longer.
     
  11. jacquesb

    jacquesb Retired Moderator

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    Riaan, as far as I know, it has been touted that single reflectors make the T5 flourescents far more efficient.....
     
  12. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Riaan, are you planning on a DIY lightin unit or buys a ready made or a custom built unit?
    If you taking the Custom built route, I suggest contacting Reef Inmates, they specialize in lighting units and will give you excellent advice dude. :)
     
  13. riyadhessa

    riyadhessa

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    Riaan so are you gonna DIY or are buying a power module...?
     
  14. RiaanP

    RiaanP Thread Starter Moderator

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    I'm going the DIY route for a 6*39W unit. It must be slimline. Like in extra slimline. Less than 100mm. My target is 50mm with splashguard.

    I did met Horst from Reef Inmates, but for other things, we did not discuss this. I saw their setups, but the unit is to high for me. I will do my design and talk to him again. Maybe something can be born out of it.

    Does anybody know what the Gieseman pendant got on top. From pictures I could see that it looked like a welded mesh. That can explain why they do not need fans.
     
  15. Nemos Janitor

    Nemos Janitor

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    Riaan the mesh is aluminium and can be obtained from Aluminium Trading . When i knock up the odd light fitting i get them to fabricate the housing. Takes them about a day or so and it's done.
     
  16. H0nda42

    H0nda42

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    Hi Riaan, how is the build going? Any pics yet? Am interested in how you are doing this. I have similar aspirations, but zero diy skills. So am hoping you might pave the way for the rest of us:)
     
  17. RiaanP

    RiaanP Thread Starter Moderator

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    I did the complete design on Sketchup.
    Unit so far is 45mm high, can be either 6 or 8 tubes with build in fans. Well it looks nice on Sketchup.

    Now needs somebody with a sheet metal bender that can handle lengths suitable for at least 58W tubes. But must be able to go 80W.
     
  18. H0nda42

    H0nda42

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    Sounds good, I look forward to the final product.
    Good luck
     
  19. RiaanP

    RiaanP Thread Starter Moderator

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    This is the expanded view for a 6 tube unit 39w. A 8 tube unit will just be wider with an extra ballast. A 54 and 80W unit will be longer.

    [​IMG]

    Who can help me with a sheet metal bender. The frame should be galvanized and the outside powder coated.
     
  20. Zuna

    Zuna

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    did you ever get to building this
     
  21. clinton stanford

    clinton stanford

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    i am also busy building a DIY unit.there will be 6 54w t5's in there.
    2x 12k white
    2x actinic
    2xblue

    my tank is 600mm wide and my unit is going to be 520mm wide.my problem is that my reflectors are quite wide and i might havto put two bulbs per reflector.the globes are quite close to each other..could that be a problem? i cant find decent reflectors that are smaller than the ones i have.
     
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